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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '247022df829fb1e217efc9bdc8b8451eeb2d44202b829f15c138262277b95c32' 
  AND token = '0D1lAW4/0loDAhOKAfUaS5DaOSisXcGdTu5uS66vNoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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