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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '594f53d972c0a8e2ae6183e6009a43555cc0abbe970c22263b2283931322b1fd' 
  AND token = 'DoxgHp4TKURXpmXt3s0JTNCMJpJf/ozpwNJ5QvPpHQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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