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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5a7824de2a1b3ce601f385f5970bfae7357eea8df9ee3a8dc4a3dd581ab7a6e' 
  AND token = 'yasfu36x84jx0FxFCVlYhFwyGD8pxv2S9+ZPRxpNFac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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