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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38ff8094471eca3b02e61ecc8949df02891e708ea755fbf6c2507933ac0545ab' 
  AND token = '0GkPbXHqSjFUUTclM7VTRO6EaLZbeHaj+P24Z+50HQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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