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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6f3fc54056fb30063b1edbf96d1caf7c84a98eeca6b20d9875dc7c81fe8a65b' 
  AND token = 'LSBvUmYosN65G51CsYXc4Op1BJtt2PEQEtjBiv14tAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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