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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46fd9b1c6dfea576aecf574b14916c03b6dbe4e191cba1d2a480bf95278eb436' 
  AND token = 'pT2QZ6APO5nHf0qlXKyQZ0TViBVD8n7k2WynQ2B03EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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