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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f325e82bb0ac1d2b63c4e4685f315ac4c925db4e42b021d8850981ed0c145b5' 
  AND token = 'yJvsuAl3pK/xsIQcnJeLlh+CF8gv5YH212nmBeI4qMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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