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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65bd18a32eda226c3d1824d997350a7dc1e0998a90fc4c3b68eebc35e58fc8b9' 
  AND token = '11RsovlqEcK5JzCcjODuYUNC3rnku3/cnABhzHPpe/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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