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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f329ec2bedf8de22425fcf2c929b47dc0da359b885c157cabf015e2af88e253' 
  AND token = 'e99mu5XIpIF/enolENuuxnKuNNFx4u8XqM56zmNvOx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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