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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd35d3550e6436d6a4060befa6d41e715e66599f492744e87818370480cc234' 
  AND token = 'QrJ+Z92ZPNEznndjx0yQVYWTt8AZepuhRtfCNUxdO+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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