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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac418de3ba7d7630c568683e3b2aa0b5efe54144b4c01e6f234213e50ae96896' 
  AND token = 'RQQjNHpq46C3eWA8uu73TGR/6IuNR7O4JuDJa9X96sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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