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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23579f0a80447eee3f93bace8e6110b5a81f914314165ce62bff096a19e382f9' 
  AND token = 'oHJ3ahAhG9zUzAW/wmfz8rDz3x4YpgE26hPs16zTSjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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