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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bca1196a1d20a95a6ab11f660dec50ef18a7a998a91a36a6fb84ffca0cae304' 
  AND token = 'Rsuz4H3bqW3h7avCIkVaaud5V/uTkKXDaBBiDqLpGkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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