SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cae28ef9a6281d134a6b73be1b51ff94761c9bbf6418e1039ff2cc69072a05e9' 
  AND token = 'm5T2zvUNRGFP3fv7uZsCoRJvggx2hYz08xkvisPisew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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