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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eee792180ac07fb87e2911409b6d8dc9ffbcb615e3b6555eaabbae0be9651c7' 
  AND token = 'QJ7VUzjcSXhYm3Yn4BQpe0yYhupcG/mPY2WrcT5BfTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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