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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dcf9c0e058e1bbd6c5fe6183958cb1060356fbfbf6b57bff76759f8bca7e1be' 
  AND token = 'nCQecDgUQseqDSqDF5tpMF+E8PokB6TSFrATAp9Vqqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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