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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3fcaac8a910b391706d852936b834c7fe754677295b87c133cbef853d3329ee' 
  AND token = 'pw0VTGDUS8GMywYAH+TOUg3LfDmkyM/81ENMHnPuiL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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