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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54cae4aa47b783e3a23f5b766f9d8b276f50cab7b6ab1a77ab4aa1b0a5203dac' 
  AND token = 'a7AKmVOaSzZYPXdFd8oQMhEvVpkKDMkyzbbqAJuahzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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