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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ea9b500c599dc9179b5bce91d5619124db73d5ec07df479c7f0ce9e62641538' 
  AND token = 'OhEfZEfgQKBIFp4PBitZRwbMDNOJeDTTk4VGLCSqN0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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