SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4da94e69b0c52165109e25a7c27d1f760b2b9abff36df5fc624cf038a53ba385' 
  AND token = 'aARZtP8Ab0i/4x0qww3y+g8fXl6OCezCHw6Q/KYBl+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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