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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a5aea67b70a30e89c672f2b7b3ed698a2a5ccfe3c7154eb2539f0d0cb97d96' 
  AND token = '3Hmuae9bYdCFt4EKCcFufrhQCS7k3ycTgpP8bQgDvcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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