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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae807d46d120a763d52e6176b109ea24477f72714b0633caa2fd54fd3ba62f1b' 
  AND token = 'EpybUKPWV6dFx1Rhrz/TW4ynn0sKQz2aGBwhDiQkkig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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