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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82ea6a6dfc5f18e43fe9180157130f33077298d5dfb083bafa122caf05e455b3' 
  AND token = 'QWV6T5qjcmiQihau47yYY5A6BR+1emHqVUo/A1mB1b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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