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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a692026007dda2bef4d193bbff64619efa1aa3dfb47d231e1940d7304bc1966a' 
  AND token = 'jVxS2Ccomy6ci/MGYpZyoXi7aq7vsksN6sLY9qZleKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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