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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9431dd80707daeb3adb8d34c0465976414c7a54b1821ef8f6641e28632cf9f99' 
  AND token = '02Mm4RO1LEaf2Gew3vCDEB9VapsqunN8JcCTFoR6dRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}