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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3371c1bf5e8ad263c024357bbec82ff5bce5bc916c00502697d70d6719582edb' 
  AND token = '3XuWNMIIlQyX5DDyGh6qSTvHf957MUol9NHTBRDiJaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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