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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c1553b3d21767f035ab6d821f1f84b0e0e8d4c28be2f25bbb74a5b37d7d924' 
  AND token = 'FJzJoGuSCjcE2d4qmsPZbLgjB8NOn38e7Im376fg8PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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