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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1398bb18ffc941f35212aef3b97d7305f1c076a15bd165db22d66b3545372ba' 
  AND token = '+SopeA7j4iGIvhvmJ3TZyf/MMh1Saa9ofFkEEycdJzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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