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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8db395daab1f05e4645bef814c7f68839e509e09d0460998a12da2bd4ddddf54' 
  AND token = 'fI3Q8AU1H8T548KoHyY3/Ofb6BAerUUuIK/74b/tj94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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