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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d1f653b513dbf8ecc9bd6f096e1779a3fce62bf4cb74b73e6ca1250b9dfedc' 
  AND token = 'PXgaTZ8GdH31D1EJ1bvxaB2osOHiPQtQZf36Mt+Sikc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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