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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa0d4433699ba0516f5a9eb99b14abaa184a6798789a256b7d15fc90f2554f8a' 
  AND token = 'Ji4A6JYUwxcgFn1Tcii80YiS374XT+MltOifBTNkX+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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