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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e4b296b4f891247515ad75fb85943a0b1b9e744223e69d514a4b8ecf81e13af' 
  AND token = 'MR+bUZgO+UHo0eXNoTBDJK1wOAiWtUtRLqwfRXQBTK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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