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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2da8e94594a37b7bd121baa1e1f9ccc6698b08c142d9b1e085dbfa2a95cfe673' 
  AND token = 'Lt51i9dwDigzCNek6hPxMep2z+TQ/wnoR3k08483ZXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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