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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9451fb09f88c7549967cb4a361915abbf36c6757ceee97ce7821bd8d83916a96' 
  AND token = 'lqS8WeeX9FmKjcK1oHfh4LhDKGo0wfR478v7BKuwoYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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