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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ca14d90bfd8e2d6ca60db6dc708b789e52a64415643d3d63dd7f7cbca34a263' 
  AND token = 'mUMb16EvuMMe1ccNWRT+lON0gHMjXHWsH9i5AxHy3hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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