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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '901fa351b181ce7ca04e7b6f285728454b189f1d35470ebb7eab85bcead0fa29' 
  AND token = 'YJj2BQc0opO5e+z7beJT2SKbaOp836Y7/oIYqgUzteY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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