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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e207fd1cc94459f951b1f625553201393296e29dc93047155d23cb857f13e407' 
  AND token = 'm84Isecyk8Kr5Qc5aLilusjbgojNDueLG4PTdwLqCD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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