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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccaaad75f33f3acce892cda74e7be4a62b6868b85c27a5dace14284afa5ab7e3' 
  AND token = '4LFTuc7eIFXfR59NgxVScRbRfn10M3IAGkHC7GCx9bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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