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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b303105f816698979b7d164cc5de454cac68d06ed651ce3363d73692d45b5c82' 
  AND token = 'F86S4mV2PWxhd0ukOeUGhmj4ItsUG7ekuLz8qdm8fkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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