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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35d82f7fda6bf508d6bad1d057d20e8dd0312cea0ff048fd3ca76386921fa5e9' 
  AND token = 'dUYqd+2u/4VQCSSeAfVEme+NVgu1ZmLYrn9cHG39cRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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