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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e68ef8a6c22566edef6341e8e99afe06b33fc27c12742300cdb46a64943023f' 
  AND token = '+jxyEpSR/uClFn4PMlS2MQCZPGTKJSbNikH2hXVKsV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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