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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c82de46fa9a65c0ac903d564068a1c1827116a3b0eefe084738001b01a090bb9' 
  AND token = 'GQVW4H38oATPKQMscHkoF5HyTni2KyNBuW7F7uy7i08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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