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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4e0f2267838f67d33e96a194483f5286855cde6c7a9b7a5f78eb759a69b8e6c' 
  AND token = 'hD7bc+/ioHgo/FRcljpfl1Lu/hMd6236m3Uaj+Z9/7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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