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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef897846d2a17a3b83f0d4538250c945126bc265fa1f64db80087827957923de' 
  AND token = 'cnLWdyCu9QsAwOvSlv6gLk7kIug3KDsynfU2zE4sfl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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