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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '802a9d4a9091d9f78d60e7df21c0c1d97fb0e65668356b1db7cd9b5e79a37744' 
  AND token = '/1j+2PN31ltIAjPg7a6n9RZI32YyjpbXlgj14/w9WjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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