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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0293ac329470daceb4cb55e4281996b8ce343fdd518a01c455203ef1d6a62954' 
  AND token = 'PmNI3h2I0g7zs6XTYqd/Lnt4MnVWo1E8kLgeCneAEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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