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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91f90b5b3ed8e1234166e696e3ffd71c3864f85377c9b13907523b88f93166ca' 
  AND token = 'l0Qbl6gnMtOeHcUHaqn+OCaEmzZrIubuZirMpNGcGlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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