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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6abfebab9a67744d046ec24a052db02dbc4a76bd4ec377381b7dbd0c1f7e469' 
  AND token = '0yEtExx+0ap97erSU7qxyNf7rMGQ28jaEwNRLLnnjLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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