SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d8497ae2cdf3a52e14b4f67329d614735696b4ad2fc94e2fb0779e9c081991d' 
  AND token = 'zA859kMBA8eo2wli/E+JCxXbZ0vmZ2zq11vvdy5pDZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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