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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f53f7c46d40dfad2347f226704ca0d221959e1566a08a2a8d53fc27e6675ff2' 
  AND token = 'B4L2pEErd30Q3D/theXhMjB6LLon0v4PLJbdjns3CWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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